Installing with OPT_AUTOCC=no trips over what appears to be an uninitialized variable:
nr@homedog ~/n/s-nail> make OPT_AUTOCC=no install
make[1]: Entering directory '/home/nr/net/s-nail'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/nr/net/s-nail'
LC_ALL=C ${MAKE} -f mk-config.mk DESTDIR="" install
/bin/sh: 1: -f: not found
makefile:18: recipe for target 'install' failed
make: *** [install] Error 127
nr@homedog ~/n/s-nail>
